Susan learned at a young age that developing good study habits, such as doing her homework, brought about good grades, and made her want to work harder in school. this is called

The right answer is reinforcement.  

Explanation:

Reinforcement learning refers to the ideal behavior or action which is strengthened by a positive reward and punished the bad ones. The individual receives rewards when they do something correctly and if they do something that is not good, they get a punishment instead. In this way, the individual tries to get as more rewards as possible and reduce penalties. In the example, we can see how Susan wants excellent grades, this would be her rewards, and she keeps on trying harder to get more.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.